Control valve for water pressure systems



1937- E. w. WORK 2,089,144

CONTROL VALVE FOR WATER PRESSURE SYSTEMS Fild Aug. 51, 1953 IAN 0701?E/PN sT K l K Patented Aug. 3, i937 UNITED, STATES PATENT OFFICE CONTROLVALVE FOR WATER PRESSURE. SYSTEMS Ernest Willy Work, Toronto, Ontario,Canada Application. August 31, 1933, Serial No. 687,724

Claims. (Cl. 50-23) sure within the system, a valve for said valve seatnormally closed by the pressure within the system and adiustably movablemember adapted to selectively engage and open the relief valve when thepressure in the system rises above a predetermined maximum, a valve forthe inlet port normally closed by the initial pressure of the'water andopened by the movement of the relief valve structure when the pressurefalls below the predetermined level. The object of the invention beingto provide a control valve which will be simple in construction,positive in its, action andwill eliminate the danger of the adhesion ofthe valve disc to. the valve seat, due to the corrosion of the valvedisc to its seat particularly after a period of inactivity during whichthe whole force of the spring presses-the valve disc against its seat.In my co-pending application No. 666,869, I have de scribedandillustrated acontrol valve somewhat similar to the control valve tobe herein described, the diflerences between this present invention andthat described in my previous application being apparent from thefollowing description andthe accompanying drawing in whichr-Fig. 1'shows a vertical section view of a control valve constructed accordingto this present invention; and

Fig. 2 is a crosssection on the line v Z1:'2"l=lg. 1.

Like charactersofreierence refer-to like parts throughout thespecification and drawing.

The control valve illustrated in :the drawing comprises a hollow bodyconsisting'of a head I and a main body portion 2 .threadably connectedtogether. The main body portion is provided with an inlet channel 1adapted for. connection to a supply of water under pressure, an inletport 4 communicating 7 between the inletichannel and the interior of themain body portion 2,, a valve seat on the saidportand an inlet valvedisc 6 therefor, closed by the initial pressure of the watel, thevalve'disc being provided with a valve stem I which projects into themain body for the purpose tolbe made apparent as the descriptionproceeds. The valvediscis supported on a spring to which prevents itfrom falling away from the seat when opened. The main body portion isalso provided with an outlet port 8 adapted for communication with thesystem, a discharge port 9 and on the discharge side of the main body,with 5 a relief valve structure consisting of a flexible diaphragm lll,responsive to pressure variations within the-body, an orifice l I in thediaphragm in axial alignment with the inlet port 4', a valve seat l2mounted on the diaphragm and extending 10 through the orifice into themain bodyportion, the valve seat being removably securedxto thediaphragm by means of the flange 13 formed thereon and overlying theflexible diaphragm and the tubular casing a. which is'threadably con- 15nected to the'valve seat. -'-I he valve seat [2 is provided with'a valvedisc l5 normally closed by the pressure within the system and opened bya movable stop 22 to be hereinafter described when the pressure risesabove a predetermined maximum. The surface of the valve disc adjacent tothe valve seat is provided with a'projection or guiding member l5apreferably square in cross section which is slidably entered into theopening through the valve seat and a member I! project ing therefrominithe opposite direction, which 25 member is provided with a recess l8into which is entered the free end of the valve stem 1. The valve discis supported on a coil spring Illa which holds the valve disc in placeand prevents it falling away from its seat when it is opened in themanner hereinafter described. A compression spring I9 is located withinthe head acts on the diaphragm resisting the movement of the diaphragmunder the force of the pressure within the system, the adjustment of thepressure of the spring being eflected by the compression screw 20 whichis screw threaded through the head I, in axial alignment with the valvedisc IS, the compression screw is formed with a central bore 2| throughwhich is entered the movable stop 22, one end of which rests on theguide member IS, the upper end of the movable stop projects through thehead i and the cap 23. The movable stop is formed or provided with ashoulder 22a which is engaged by the adjustable screw 23a screw threadedthrough the cap 23 and arrests the movement of the stop. The pressure atwhich the relief valve will open may be regulatedby; advancing orretarding the adjusting nut towards or away from the shoulder. If thecontrol valve is operated in the reverse position the springs 6a and Ila. may be dispensed with.

In operation, the inlet channel is connected to l a water supply lineunder pressure and the outlet port 8 is connected to the water pressuresystem. With the valve in the position shown in the drawing the water isbeing admitted to the 1 system through the inlet port I, the inlet valvedisc having been moved away from its seat by the action of the spring I!moving the relief valve structure towards the inlet opening therebybringing the member IS in contact with the stem 1. As the pressure inthe system rises it acts on the diaphragm thereby moving the member I Iaway from the stem 1, permitting the valve disc 6 to be moved towardsits seat by the pressure oi the supply water shutting oi! the flow ofwater into the system entirely when the predetermined minimum pressureof the system is reached, this minimum pressure being set by the tensionof the compression spring I! acting on the diaphragm. As the pressurewithin the system rises, for example by expansion of the water withinthe system, further pressure is exerted on the diaphragm moving it andthe relief valve towards the head I, this movement continuing until theshoulder of the movable stop contacts with the cap 23, this occurringwhen the predetermined maximum pressure is reached. The predeterminedmaximum preasure at which the relief valve is desired to open depends onthetravel of the adjustable stop, this being regulated by increasing ordecreasing the distance between the screw 23a and the head, this beingelected by means of the adjusting nut 24 on the end of the cap adjacentthe head. Whenever desired it maybe determined whetherthe control valveis in proper working condition by manually actunating the movable stopdownwards, thus moving relief valve disc out of engagement with itsseat, thereby permitting the water to flow out of the system through thedischarge port and by continuing the movement of the stop further,moving the inlet valve disc out of engagement with its seat. In thismanner it can be quickly ascertalncd whetherthe valve discs arefunctioning properly. As soon as the pressure is released from themovable stop the valve discs will immediately be returned to theirnormal position.

It will be observed that in avalve constructe according to thisinvention that the only pressure acting to force the valve disc againstits seat is the fluid pressure within the system, in the case of therelief valve and the initial pressure in the feed line, in the case ofthe reducing valve.

Having thus fully described my invention what I claim as new and desireto secure by letters Patent is:

1. A control mechanism for maintaining the pressure within a fluidpressure system between a predetermined maximum and minimum, comprisinga sectional casing having an inlet, an outlet and a discharge. andfurther having a transverse. partition between the inlet and the outlet,a disk-likediaphragm having only its' marginal portion anchored betweenthe sections of the casing, said diaphragm being located between saidoutlet and saiddischarge, a valve "seat carriedby said diaphragm, alaterally ported cup-like member mounted on said partition and having avalve seat communicating with said in let, a laterally ported tubularmember connected with said first named valve seat and slidable axiallyof said cup-like member, a valve within said tubular member forcooperation with said first named valve seat, spring means within saidtubular member normally urging said valve to its seat, a second valvecooperating with said second named valve seat, spring means normallyurging said second named valve to its seat, and a strut connectionbetween both of said valves.

2. A control mechanism for maintaining the pressure within a fluidpressure system between a predetermined maximum and minimum, comprisinga sectional casing having an inlet, an outlet and a discharge, andfurther having a transverse partition between the inlet and the outlet,a disk-like diaphragm having only its marginal portion anchored betweenthe section of the casing, said diaphragm 'being located between saidoutlet and said discharge, a valve seat carried by said diaphragm, alaterally ported cup-like member mounted on said partition and having avalve seat communicating-with said inlet, a laterally ported tubularmember connected with said first named valve seat and 'slidable axiallyof said cup-like member, a valve within said tubular member forcooperation with said first named valve seat, spring means within saidtubular member normally urging said valve to its seat, a second valvecooperating with said second named valve seat, spring means normallyurging said second named valve to its seat, a strut connection betweenboth oi said valves. and a plunger slidable (mm the exterior of thecasing for unseating both valves.

' 3. A control mechanism for afluid-pressure system comprising a hollowbody having an inlet, an outlet and a discharge opening and a partitionbetween the inlet and the outlet, said partition being formed with anopening, a laterally ported cup-like member seated on said partition andhaving a reduced extension threaded through the opening therein andprojecting beyond the inlet side oi'the partition, said projecting endbeing formed as a valve seat, a laterally portedtubular member slidablymounted within said cup-like member, a diaphragm carried by said tubularmember, a valve seat screwed into the tubular member and having aportioncooperating with the tubular member for clamping the diaphragm thereto,a valve for cooperation with said second named valve seat, spring meanswithin the tubular member for urging said valve toward said second namedseat, a piston having a spring housed therewithin and carrying a valvefor cooperation with said first named valve seat, a strut secured tosaid piston and having abutting engagement with one side 0! said firstnamed valve, adjustable spring means opposing movement at said diaphragmunder'the influence of pressure within the system, and a longitudinallyslidable member limiting movement of the first named valve and operablefrom the exterior of the device to unseat both of said valves, saidstrut constituting the operative connection between said valves.

,4. A control mechanism for a fluid pressure system for maintaining thepressure within the system between maximum and minimum limits,comprising a hollow bodyhaving an inlet, an outlet and a relief opening,a diaphragm located between the outlet and the relief opening, a valveseat carried by said diaphragm, adjustable spring means engaging saidseal: for resisting movement of the diaphragm in response to increase ofpressure within the system, a valve cooperating with said seat andnormally maintained on said seat by the pressure within said'system andmovable in engagement therewith during predetermined movement ot'thediaphragm in response to increase of pressure within the system, anabutment member extending exteriorly oi the body havingllmited'longitudinal movement within the body in en gement with saidvalve for maintaining the same stationary after predetermined movementof said valve seat and valve with the diaphragm whereby continuedmovement of the diaphragm and valve seat under the influence of 5increased pressure within the system will cause separation of said seatand valve, a partition between the inlet and the outlet, a valve seatwithin said partition, a normally closed inlet valve cooperating withsaid second named seat and of 10 greater size than the same to besubjected to the pressure of fluid entering the inlet and the pressurewithin the system, and a strut carried by one valve and abutting theother for unseating said inlet valve whenthe pressure within the sys- 15tem is below the minimum predetermined pressure.

5. A control mechanism for maintaining the pressure within a fluidpressure system between a predetermined maximum and minimum, com- 20prising a sectional casing having an inlet, an

outlet and a discharge, and further having a partition between the inletand the outlet, a diaphragm having its marginal portion anchored betweenthe sections of the casing, said diaphragm being located between saidoutlet and 5 said discharge, a valve seat carried by saiddiaphragm, alaterally ported cup-like member mounted on said partition and having avalve seat communicating with said inlet, a laterally ported tubularmember connected with said first named valve seat and slidable axiallyof said cupiike member, a valve within said tubular member forcooperation with said first named valve seat and normally maintainedclosed by the pressure within the system, a valve cooperating with said15 second named valve seat, spring means normally urging said secondnamed valve to its seat, and

a strut connectionbetween both of said valves.

1 E. W. WORK." 20 I

